Pipe coupling



FIG. 1 is a perspective view of our design for a pipe coupling;

FIG. 2 is a front view of the design for the pipe coupling shown in FIG.1 , the rear view being the same;

FIG. 3 is a bottom view of the design for the pipe coupling shown inFIG. 1 ;

FIG. 4 is a top view of the design for the pipe coupling shown in FIG. 1;

FIG. 5 is a left side view of the design for the pipe coupling shown inFIG. 1 ; and,

FIG. 6 is a right side view of the design for the pipe coupling shown inFIG. 1 .

CLAIM We claim the ornamental design for a pipe coupling, as shown anddescribed.